Android手势操作(二)

package cn.c;
import java.io.File;
import java.util.ArrayList;
import android.app.Activity;
import android.gesture.Gesture;
import android.gesture.GestureLibraries;
import android.gesture.GestureLibrary;
import android.gesture.GestureOverlayView;
import android.gesture.GestureOverlayView.OnGesturePerformedListener;
import android.gesture.Prediction;
import android.os.Bundle;
import android.os.Environment;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.widget.Button;
import android.widget.EditText;
/**
 * 需求描述:
 * 在例子1的基础上增加手势识别.
 * 所以不用再写添加手势的步骤.
 * 错误总结:
 * 在手势识别的时候没有执行mGestureLibrary.load()
 * 导致mGestureLibrary.recognize()方法失败.
 * 该错误很类似于刚开始操作 SharedPreferences的时候
 * Editor没有执行commit()方法
 *
 */
public class MainActivity extends Activity {
    private EditText mEditText;
    private GestureOverlayView mGestureOverlayView;
    private GestureLibrary mGestureLibrary;
    private Gesture mGesture;
    private Button mSaveButton;
    private Button mResetButton;
    private String mGestureLibraryPath;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        init();
    }

	private void init() {
		mEditText = (EditText) findViewById(R.id.editText);
		mEditText.setOnKeyListener(new OnKeyListener() {
			public boolean onKey(View v, int keyCode, KeyEvent event) {
				if (mGesture!=null&&mEditText.getText().toString().length()>0) {
					mSaveButton.setEnabled(true);
				} else {
					mSaveButton.setEnabled(false);
				}
				return false;
			}
		});
		mGestureOverlayView = 
		(GestureOverlayView) findViewById(R.id.gestureOverlayView);
		mSaveButton = (Button) findViewById(R.id.saveButton);
		mSaveButton.setEnabled(false);
		mResetButton = (Button) findViewById(R.id.resetButton);
		//GestureLibrary文件的路径
		mGestureLibraryPath =
		Environment.getExternalStorageDirectory()+File.separator+"gesturesTest";
		//为GestureOverlayView添加监听事件
		mGestureOverlayView.addOnGesturePerformedListener(new GesturePerformedListenerImpl());
	}
	
	private class GesturePerformedListenerImpl implements OnGesturePerformedListener{
		public void onGesturePerformed(GestureOverlayView overlay,Gesture gesture) {
			// 加载该路径下的手势库.
			// 若不存在,则会在路径下创建一个手势库
			mGestureLibraryPath =
			Environment.getExternalStorageDirectory()+File.separator+"gesturesTest";
			mGestureLibrary = GestureLibraries.fromFile(mGestureLibraryPath);
			//加载手势库
			//一定要执行load()方法,否则recognize()没有用!
			if (mGestureLibrary.load()) {
				ArrayList<Prediction> predictionsList=mGestureLibrary.recognize(gesture);
				if (predictionsList.size()>0) {
					Prediction bestPrediction=predictionsList.get(0);
					if (bestPrediction.score>7.0) {
						 System.out.println("xxxx1111 该手势已经存在");
					}
				} else {
	              System.out.println("xxxx1111 该手势不存在");
				}
			} else {
				System.out.println("xxxx1111 加载手势库失败");
			}
			
		}
		
	}
	
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/linearLayout"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/textView"
            android:layout_width="100dip"
            android:layout_height="wrap_content"
            android:text="手势的名称:" />

        <EditText
            android:id="@+id/editText"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:hint="在此输入" />
    </LinearLayout>
 <android.gesture.GestureOverlayView
     android:id="@+id/gestureOverlayView"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:layout_below="@id/linearLayout"
     android:layout_marginBottom="50dip"
     android:gestureStrokeType="multiple"
  />
  <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="50dip"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal" >
    <Button 
        android:id="@+id/saveButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1" 
        android:text="保存"
        />
     <Button 
        android:id="@+id/resetButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1" 
        android:text="重置"
        />
   </LinearLayout>
 
</RelativeLayout>